Koce-dkill



L. WHITE 8; J. T. BUMGARNER. ROCK DRILL.

N 22346, Patented Nov. 9, 1858.

UNITED STATES PATENT ormon.

ROCK-DRILL.

Specification of Letters Patent No. 22,046, dated November 9, 1858.

To all whom it may concern:

Be it known that we, L. WHITE and J. T. BUMGARNER, of Davenport, in the county of Scott and State of Iowa, have invented a new and Improved Rock-Drill; and we do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings, making a part of this specification, in which- Figure 1, is a side sectional view of our invention taken in the line in, m, Fig. 2. Fig. 2, is a plan or top view of ditto.

Similar letters of reference indicate corresponding parts in the two figures.

This invention consists in operating the drill, giving it its driving power, by means of a cam, and giving the feed motion to the drill by means of a ratchet and screw peculiarly arranged and operated, the working parts being connected with a swinging or adjustable frame and the whole arranged as hereinafter fully shown and described, whereby the drill is operated by a positive movement, the feed motion rendered capable of being graduated as desired, and the drill allowed to be placed at different degrees of inclination according to the work to be performed.

To enable those skilled in the art to fully understand and construct our invention we will proceed to describe it.

A, represents the frame of the machine, which may be of metal or wood, metal would probably be preferable, and B, is a frame which is fitted within the frame A. The frame B, is attached by bearings a, a, to a shaft 0, on the upper part of frame A, the frame being allowed to swing freely on said shaft. The back part of the frame B, has a curved slot 6, made in it, said slot forming the part of a circle of which the shaft C, is the center. This will be clearly understood by referring to Fig. 1. The frame B, may be of metal, at least that would be the most preferable material. One the shaft C, a cam D, is placed. This cam is formed of a metal wheel having a groove 0, made in one side of it, said groove having the form of three curves of parabolic or approximate form connected at their inner ends as shown clearly in Fig. 1.

E, is a sliding bar which is fitted in proper guides d, on the frame B. The upper end of this bar has a friction roller 6,

attached to one side of it, Said roller being fitted in the groove 0, of the cam. To the bar E, an arm F, is attached at right angles and at the outer end of said arm a socket f is formed, said socket having an internal screw thread and forming a nut for a screw rod G. The screw rod G, has a groove 5 made longitudinally in it and a feather h, at the inner side or part of a nut H, fits in said groove, as shown clearly in Fig. 2. The nut H, works on the screw rod G, and rests 011 the upper end of the socket f. The periphery of the nut has ratchet teeth 2', formed on it and a pawl j, engages with said teeth, the pawl being pivoted to a collar is, which encompasses and is allowed to turn freely on the nut. To the collar 76, a sliding arm I, is attached by a pivot or pin Z, said pin or pivot fitting in a slot m, in the end of the sliding arm I, as shown clearly in Fig. 2. The arm I, works in a guide 91., attached to the arm F, and to the inner part of said arm a friction roller 0, is secured, said roller fitting in a slot 79, made in a plate J, the lower part of which is pivoted to the frame B, as shown at 0, in Fig. 1. The upper end of the plate J, has a cross slot r, made in it, and a screw .9, passes through said slot into the frame securing the top part of the plate to the frame.

K, is a drill rod which passes longitudinally through the screw rod G, and is secured in proper position by two collars t, 25, which are placed on the rod and secured to it by set screws, one collar being above and the other below the screw rod, as shown clearly in Fig. 1. A spiral spring a, is interposed between the lower collar t, and the lower end of the screw rod.

K, is the drill at the lower end of the rod. To one or both ends of the shaft C, a crank L, is attached.

The operation is as follows :The shaft 0, is rotated in any proper way and as the cam I), rotates, the sliding bar E, is raised and lowered and also the arm F, and drill rod K, the parts having a positive motion as the groove 0, forces the drill rod down, the drill depending alone upon such force to perform its work. Each time the drill rod descends the screw G, is turned a certain distance by the nut H, which is actuated by the arm I, in consequence of its roller 0,

fitting in the slot 79, of the plate J. The drill rod K, is turned with the screw in consequence of its upper collar 25, having projections 6, attached which fit in recesses in a hand wheel t, attached to the upper end of the screw. The turning therefore of the screw rod G, rotates the drill and also feeds the drill to its work, and the feed movement may be regulated by adjusting the plate J, in a more or less inclined position so as to increase or diminish the length of the movement of the arm I. The spring u, at the lower end of the screw rod G, compensates for the recoil of the drill and prevents the screw rod and arm F, from being injured thereby.

The drill K, is of the usual form and the drill rod. K, may be inclined more or less as may be desired by adjusting the frame B, on the shaft C, the frame being secured in the desired position by means of a screw and nut '0, w, the screw '22, being attached to the frame A, and passing through the slot 6. If necessary the frame A, may be placed in a horizontal position in order that the drill may work in a position inclining upward. In case the screw rod G, should be fed down the distance of its length, the rod by loosening the collars t, t, may be screwed up and secured upon the drill rod at a higher point, so that the Work may be continued.

Having thus described our invention what we claim as new and desire to secure by Letters Patent, is

1. The combination of the cam D, swinging adjustable frame B, slide bar E, and screw rod Gr, containing the drill rod K, arranged substantially as and for the purpose set forth.

2. The combination of the adjustable plate J, attached to the frame B, arm I, nut H, with collar K, and pawl j, attached, the whole being arranged substantially as described.

3. e claim the spring a, interposed between the lower collar 6, on the drill rod and the lower end of the screw rod G, for the purpose specified.

l. We claim placing the screw rod G, on the drill rod K, between two adjustable collars t, t, substantially as shown and described, so that when the screw rod has been fed or moved down the distance of its length, it may by loosening or detaching the collars be raised on the drill rod and secured upon it higher up in order to continue the work.

LYMAN WHITE. 'J. T. BUMGARNER.

\Vitnesses D. B. Mc-KoWN, ALEXR. C. TAYLOR. 

